Flax-sieve for threshing-machines.



L. L. THOMPSN.

FLAX SIEVE FR THRESHING MACHINES.

APPLICATION FILED MAR. 9. 1911.

1 1 1 16, 1 67. Patented Nov. 3, 1914.

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THE NoRR/S PEYERS Co., PNOTO-LITHO. WASHIN mN, 1, r,

L. L. THOMPSON.

PLAX SIEVE FOR THRESHING MACHINES.

APPLICATION FILED MAR. 9. 1911- Patented Nov. 3, 1914.

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FLAX SIEVE-POR THRESHING MACHINES.

APPLICATION FILED Mmm. 1911.

1,1 16, 167. Patented Nov. 3, 1914.

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IHF NORR/ s PErERS rn.. PHOTO-LITRO wAsHlNcmN4 Dmc erre; sriiipnrafrn "T.FFICE Leners L. THoivirsoN, or AUSTIN, MINNESOTA.

FLAX-SIEVE FOR Tft-IRESHING-MACHINES. i

Specification ofLctters Patent.`

Application filed March 9, 1911. SerialNo. 613,360. i

chines or grain separators, and is particu-` larly directed to theprovislon of an improved sieve or arrangement of sieves adapting thesame for the separation of flax.

To the above ends, the invention consists of the novel devices andcombinations of devices hereinafter described and defined in the claims.

ln a threshing machine or separator, adjustable sieves made upofpivotally adjustable supplemental slats are now quite generally`employechand these sieves are highly efficient for the separation ofwheat, oats, and various other seeds generally designated as succotash.lt has been found, however, that they are not efficient in themselvesfor the separation of flax in a threshing machine, and that asupplemental or additional sieve is required underneath the ordinaryadjustable slat sieve to complete or insure theproper separation of theflax seeds from the straw chaff seeds and other materials usually mixedtherewith. This additional or supplemental underlying flax sieve hasusually been made removable and it was only by considerable labor and byrequiring interruption in the operation of the threshing machine that itwas applied for the separation of flax, or removed for the separation ofsuccotash.

In accordance with my invention, I construct this supplementalunderlying flax sieve in sections which are movable, preferably,pivotally so that in an instant the said flax sieve may be renderedoperative or entirely thrown out of action. rlhis, as is evident, adaptsthe sieve mechanism of the threshing machine to be instantly adjustedfor any kind of work, even Without in the least interrupting the actionof the threshing machine or stopping the same.

The invention in its preferred form is illustrated in the accompanyingdrawings ntate f PatentedNov.` 3,1914."

wherein like characters indicate" like parts Y throughout the severalviews. j

Referring to the drawings, Figure l is a vertical section showing thesieve structures and certain cope ative parts ofthe threshing machineillustrating my invention, in-i corporated therein; Fig. 2 is a planview of the improved flax supplemental, or flax sieve, some parts beingbroken away; Fig. 3 is a detail with some parts broken away, showing `asieve adjusting device; Fig. l is a detail in section on the line ai artof Fig. 3;

5 is an enlarged vertical section showing portions of the overlying andunderlying adjustable sieves; and Fig. 6 is a transverse verticalsection taken through the flax sieve on the line w ai of Fig. 2.

Of the parts of the threshing machine or separator, the numeral l,indicates the frame or case, the numeral 2 the rear wheels, the numeral3 the fan, the numeral 4l a straw rack, Il a chafler, and the numeral 5a vibratory sieve shoe, which latter has an inclined imperforate bottomdelivering to a transverse grain spout G, all of which parts are ofstandard or suitable construction.

The shoe 5 is vibrated longitudinally of the machine by the usual or anysuitable means, not shown, and it carries the upper adjustable slatsieve, which is preferably of the type known to the trade as the Closz`& Howard adjustable sieve, and which, in Fig. l, is indicated as anentirety by the numeral 7. The lower or so-called supplemental flaxsieve is shown as provided with a rectangular marginal frame 8 that isrigidly secured to the sides of the shoe 5 and is provided with a sievesurface madel up of a multiplicity of supplemental perforated slats 9,the edges of which are preferably overlapped and the intermediateportions of which are securedfto small transverse rods 10 which at theirends are pivoted in the sides of the said frame 8. The slat at thedelivery end of this sieve is overlapped with a perforated slat 11,rigidly secured to the transverse bar of the frame 8 that is located atthe delivery end of the sieve. Preferably, the slats 9 are ar 'anged inlaterally spaced rows on the opposite sides of a central divider bar 8asecured to the ends of the frame S, and cleats 8b are also preferablysecured on the upper edges of the sides of the said frame 8 so as toafford two channels directing the grain or stock over the sieve surface.At their inner ends,

the slats 9 are provided with depending flanges 92L that are pivoted toa common adjusting bar 12. This adjusting bar 12 is provided with anupwardly projecting pin 13 (see Fig. 5), that loosely engages a seat ina, rack bar 141-, that is held byV suitable At one end, outside of theshoe 5 (see Figs. Y

2 and (i) the shaft 17 is provided with an operating wheel or head 19that is detachably secured thereto by a pin 20. The hub ofthe wheel 19at its outer face is provided with circumferentially spaced notches 21that are frictionally engaged by a V-shape projection 22 of a flatspring 23. This spring at one end is shown as secured to the outer faceof one side of the shoe 5 by an ordinary screw 2i, and at its other endby a tliumb nut and screw 25.

The engagement of the spring projection 22 with the notches 21yieldingly holds the wheel 19 in various dierent positions so as to holdthe sieve slats 9 eitherin their closed position shown by full lines inFig. 5 or in their extreme open positions shown by dotted lines in saidFig. 5, or in any intermediate position. t is evident that suchadjustments of the said slats 9 may be easily and f simultaneouslymoving the pivoted sections of the said lower sieve into inoperativepositions.

quickly elfected simply by rotating the wheel 19 and shaft17. n thisway, the lower or supplemental sieve may be almost instantly renderedoperative or inoperative at will.

The perforations in the slats 9I when the should, ofcourse, be of theproper size to permit seeds to fall through the same.

l/Vhile thev primary purpose of this supplemental sieve is for theseparation of flax, it f may, however be used for other purposes. Forinstance, thesieve may be designed primarily for the separat-ion of amain body of oats from other grains or seeds, in which case theperforations in the slats 9 would be large enough to pass wheattherethrough, but not large enough to pass oats therethrough. Y

When the sieve illustrated is to be applied vto the shoe 5 or to beremoved4 therefrom,

the spring 23 should be loosened or moved from working position, thenthe pin 2O being withdrawn, the wheel 19 may be removed from the shaft17, and then the said shaft 17 may be slid endwise toward the left inErespect to Fig. 6, so as to carry the right hand side of the said shoe5.

hand end of the said shaft through the right Vhat I claim is: y 1. Thecombination with an upper sieve,

of a lower sieve arranged to receive from said upper sieve andcooperating therewith in the separation of materials, the said lowersieve comprising elements movable into inoperative positions.

2. The combination with an upper sieve, of a lower sieve arranged toreceive from the said upper sieve and to coperate therewithin theseparation of materials, the said lower sieve comprising a multiplicityof perforated pivoted slats adapted to be moved pivotally intoinoperative open positions.

3. The combination with van upper sieve, of a lower sieve arranged toreceive from said upper sieve and cooperating therewith 4 in theseparation of materials, and the said lower sieve comprising amultiplicity of pivoted perforated sections, and means for En testimonywhereof' l afiiX my signature l in presence of two witnesses. sieve isdesigned for the separation of flax,

LAURIS L. THGMPSON.

Witnesses:

Bannion Gr. VVi-riinnsn', HARRY D. Kineonn.

Copies' o this patent may be obtained for five cents each, by addressingthe Gommssioner of Patents, Washington, E. f3.

